It is all but certain that the holographic principle [1]}[2]}, entanglement [3]}[4]}[5]}, and complexity growth [6]} are the essential quantum-mechanical mechanisms that lead, in appropriate limits,
to the emergence of classical space-time geometry. It would be very surprising if they did not play an outsize role in cosmology, but so far we know very little about how they work in de Sitter space, or in other cosmological space-times.
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